Electric alarm.



No. 700,585. Patented May 20, I902.

D. VIAL, FILS.

ELECTRIC ALARM.

lApplication filed July 31, 1901.]

(Nn ModeL) W l n e sses LIVIZ for E I n f fuz'noams PEYERS co pnmoumo WASHINGTON n c 5o ported freely movable on the part F.

UNITED STATES PATENT DENIS VIAL, FILS, OF LYONS, FRANCE.

ELECTRIC ALARM.

SPECIFICATION forming part of Letters Patent No. 700,585, dated May 20, 1902.

Application filed July 31, 1901. Serial No. 70,381. (No model.)

T0 at whom it may concern.-

Be it known that I, DENIs VIAL, Fils, a citi- Zen of the Republic of France, residing in Lyons, France, have invented certain new and useful Improvements in Circuit-Closing Devices, of which the following is a specification.

This invention relates to circuit-closing devices adapted for use especially in electric burglar-alarm systems; and the object of the invention is to provide a device of this class which may be applied to the door or other movable part of the building, which operates by the swinging of a pendulum, which does not require great care in setting up, and which is not affected by sagging of the door or other displacement, which is simple and reliable in action, and which automatically cuts off the current after use. For this purpose the invention consists in the combination of two contact-pieces, one above the other, a washer, of conducting material, supported on the lower contact-piece, and a compound pendulum suspended from the upper contact-piece, the upper member of said pendulum being made of conducting material and passing through said washer and the lower member being connected thereto below the washer.

In the accompanying drawings, Figure 1 is a front View; and Fig. 2, a section on line w :0, Fig. l, of a circuit-closer constructed according to my invention.

Similar letters of reference indicate corresponding parts.

In the drawings, A indicates the base or support, and B G the lower and upper contactpieces, respectively, said base being made of insulating material and the contact-pieces of conducting material. The conducting-wires D E of the electric circuit are connected in any suitable manner to the contact-pieces. The contact-piece B has a horizontal portion F with an opening located below the upper contact-piece O, and from said upper contactpiece is suspended a compound pendulum, of which the upper member H is made of conducting material and' passes through said opening and through a smaller opening of a washer G, also of conducting material, sup- The lower member of the pendulum is pivoted to the upper member II below the washer and carries the pendulum-bob.

The device is applied to the door or other movable part of the building by screwing the base A thereto. opening causes the pendulum to swing, whereby the upper member II is brought into contact with the washer, the circuit being thereby closed momentarily and passing in the course E B F G H C D. Upon the return swing of the pendulum the current is interrupted momentarily while the member H is passing across the the opening of the washer, and when said member contacts with the other side of the washer the circuit is again established. As the pendulum swings from side to side the circuit is thus intermittently opened and closed.

The compound pendulum secures the longer contact at each closing of the circuit than would be the case if a simple pendulum having a continuous rigid rod were employed. l Vhen approaching rest, the washer is automatically left in central position relatively to the pendulum-rod, the oscillations becoming so short that the pendulum-rod does not contact with the washer, whereby the circuit is permanently broken, the pendulum finally coming to rest and hanging centrally through the hole in the washer.

It is obvious that when applying the device to the door great care is not necessary, as it is not required that the device be applied in absolutely vertical position, as the pendulum when once set in motion and allowed to come to rest automatically centers the washer, So that the circuit is broken when the pendulum is at rest. sagging of the door or any slight displacement of the device from any cause does not aft'ect its operation in the least, and the same furnishes a simple and reliable means of closing the circuit of electric burglar-alarms.

. Having thus described my invention, I claim as new and desire to secure by Letters Patent-- A circuit-closing device, consisting of two contact-pieces, one above the other, a washer of conducting material supported on the lower The motion of the door upon contact-piece, andaeompound pendulum sus- In testimony that I claim the foregoing as pended from the upper contact-piece, the up my invention I have signed my name in presper niemberof said pendulum being made of ence of two subscribing Witnesses.

conducting material and passing through said DENIS VIAL, FILS. 5 washer and the lower member being eonneet- Witnesses:

- ed thereto below the Washer, substantially as O. OHARBONNET,

set forth. S. ASSIER. 

